ICSE Class 10 Chemistry 2020 Solved Paper

Identify the salts $P, Q, R$ from the following observations :

Question : 72 of 86

Marks: +1, -0

Salt

{Q}

is white in colour. On strong heating, it produces buff yellow residue and liberates reddish brown gas. Solution of salt

{Q}

produces chalky white insoluble precipitate with excess of ammonium hydroxide.

Solution:

Salt

{\Q}= {\Pb} ( {\NO}_3) _2

Lead nitrate.

{\Pb} ( {\NO}_3) _2

is white in colour and on heating decomposes to yellow residue

{\PbO}

and a reddish brown gas nitrogen dioxide.

{\Pb} ( {\NO}_3) _2

reacts with excess

{\NH}_4 {\OH}

to give white ppt. of

{\Pb}( {\OH})_2

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